Combined Call 2026-01-14

Agenda

• Design docs and/or RFCs
  • Fujitsu test suite ease of use
    • It’s not easily usable as-is right now: very large, includes C++ tests, lacks the expected flang result, etc.
    • Issues have been opened in the Fujitsu test repo to make a subset of the suite for Flang-only tests
      • https://github.com/fujitsu/compiler-test-suite/issues/53
      • Another Fujitsu issue to request not to build C/C++ when testing Fortran: https://github.com/fujitsu/compiler-test-suite/issues/52
    • Perhaps eventually bring this inside the LLVM test suite directly, after fixes are added
    • Does Linaro have a bot that is running this currently?
  • Flang-tidy
    • Issue seems to be that many of the checks could be done in Flang itself rather than the tool
    • What about in-place correction of the source code (ala clang-tidy)?
    • Could we make some of the checks the tool uses available to the Flang driver as well?
    • Idea: split the checks up and give the ones that have a repair mechanism to flang-tidy and the rest go to the Flang driver
    • Do we bring the tool in as-is, then start a process of refactoring to create a separate library of checks?
    • Need to talk to the original contributors to make sure they are still invested, also need to check-in with Peter Klausler and need to find a maintainer for the tool once merged
  • [RFC] What to do regarding the Flang Call Notes document
    *
  • [RFC] Support classic flang driver options in flang
    *
  • Cross-compilation of real(kind=16)
    *
  • [RFC] Support -fstrict-aliasing and -fno-strict-aliasing
    • Related issue: https://github.com/llvm/llvm-project/issues/171912
  • `-ffp-contract=fast` Violates the Fortran Standard
    • Still under debate
  • Changes to builtin modules
    • PR was reverted due to buildbot failure involving Windows
    • Undergoing another review process, will not try landing again until after the first of the year
  • [RFC] Use pre-compiled headers to speed up LLVM build by ~1.5-2x
    • Related to what has already been done in Flang, attempt to use this approach more generally
    • Draft PR: https://github.com/llvm/llvm-project/pull/173868
• PRs of Note
  • [Flang][FIR] Introduce FIRToCoreMLIR pass. #168703
• Issues of Note
  • Building Flang with offload support
• FYI
  • LLVM 22.x has branched, first RC expected Friday 1/16: https://discourse.llvm.org/t/llvm-22-x-has-branched/89447
  • 2026 LLVM Community Area Team Elections - Call for Nominations
  • Added LoopInvariantCodeMotion pass for [HL]FIR. (PR #173438)
• Other topics as time allows
  • One-off additional call next Wednesday at the same start time. Meeting link to be posted on slack and here in the notes.

    • https://lanl-us.webex.com/lanl-us/j.php?MTID=mf9e0b3ff7ba2ba9d5dbdeb510296cf5e

    • Wednesday, January 21, 2026 9:30 AM | 30 minutes | (UTC-07:00) Mountain Time (US & Canada)

    • Meeting number: 2488 038 4796

    • Password: mY9p2pMx6tm

    • Join by video system

    • Dial 24880384796@lanl-us.webex.com

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Details

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